Rolled metal article.



UNITED STA'LES PATENT OFFICE.

FnaNx'N. SPELLEB, or moxnasrom, PENNSYLVANIA., salomon To NATIONAL TUBErrrrsnuaau. PENNSYLVANIA, 4 coaronarIoN or NEW amar.

aoLLnn u METAL ARTICLE Be it known that I, linANx N. SrnLLEn, ofMcKeesport, Allegheny county, APennsyl- Vania, have invented anew' anduseful Rolled Metal Article,of which the following isa full, clear, andexact description, reference being had to the accompanying drawings,formlng part of this specllication, in which-- Figure 1 is a lan viewshowing the surface of a metal blbom or blank after the first pass wherea three-hi mill is used; Fig. 2 is a 4cross-section on t e line II-IIoflg. 1 Figs. 3, 4, 5,'and 6 are cross-sections similar to Fig. 2showing the metal in the next four successive passes; Fig. 7 is acrosssectio'n of a skelp. showing the character of the plate formed bymy process; and Fig. 8 isl an enlargedview showing the wedge action ofthe preferred form of projections.

Myinvention relates to vthe rolling of steel, and is particularly usefulin the manu ufacture of steel plates used in the man l ture of weldedpipes. It is a well knwn fact that welded pipes will eorrode andfbe comepitted under .unfavorable conditions.

The object of my invention is to reduce this'. liability to corrosionand pitting, and to improve the surface ortion of the steel plate, andthe pipe, w ere my process is used in such manufacture.

Thei'nventi on is broadly 'applicable to the i rolling of blanks,plates, shapes, or any `finished steell products; although it isof 'Iecial advantage in pipe manufacture..

essi have discovered that by breaking up one or both surfaces of thesteel blank or the product ofthe mil is improved in quality,

article during the rolling by wed e shaped projections on` the roll orrol s acting thi-ou hout the surface to be treated, and the'n attening,'the outer portion so treated belng densified and -rendered less subjectto corrosion. I attrib-v quality to the wedging action 4of the rollpro'ections, and. to the rolling in or retaining o 'a greater portionVof the scale or oxidV thanv formerly;A but whatever the exact actionmay be, the result is that the -outer or surface portion is improved,bein infact made practically homogeneous, an

l is rendered more .uniform in character. x In carrying out my inventionin the manspecmomon' or Leners Patent. .ippuuon many ze, 199e. sms: mi.snaar.

plate may be one or both Patented Oct. 24, 1911.

facture of steel plates for making welded pipe, the rolls by which theslab or billet is reduced, are not formed with substantiallv smoothfaces as heretofore, lbut of them is provided with a sereaof angledWedges which form wedge shaped indentations as indicated at 2, 2, in theblank 3, shown in Fig. 1. The indentations are sulciently close so thatthey break up and reworle substantially the entire face of the late orsubstantialiy the entire portion to Ee treated; but as shown a smalledge portion 3 is preferably lleft at the opposite edges of the rolls,to prevent spelling of the rol or rolls.

In case the... late is to betreated'on both sides, the weges .may beapplied simultaneously or successively; that 1s, the plate may be passedbetween a pair of rolls, each of which is so shaped, or it 'may' beassed through rolls, only one of which 1s sos aped, and then throu hanother pass, of which the other vroll so s apes the other face of theplate, If the successive method is used, the

assed through a two-high mill, one of wlibse rolls is so shaped, andthe` plate may then be another two-high mill in which the 'other face ofthe plate is so treatedyor the plate may be passed through the top andbottom passes successively o a three-high Inillin which the middle rollisprovided with the wedges. Afterthus treating one or both faces of thelate, the platey may then be rolled out int e ordinary manner to Hattenit, andV the operation isv repeated two or more times untii the metalsurface becomes plain or nearly so. I prefer, however, after the firstwedgc .action to further break up passed through the surface by changingthe sha e or otherwise altering the projections or roken surface. Forthis purpose, I preferably use further rolls in which depressions areformed in the apices of the ived ridges. Imay thus increase the numberoindentations and reduce otherwise change the sha e, size or number ofthefindentations whic y formed. If this second indenting or breaking upis'femployed it also may be appliedto may be indented at'a time.

their original size, or I may were previously faces and one or bothsurfaceL In. the drawings, where I heve shown' the nmnufacture ofv skelpaccording to m mventi on, starting for example, with a b oom 3Q inchesinthiclmess, this would be passed between the middle and lower rollofathreehigh millhavin the middle roll provided with the-projectlons orindentations. This would result 1n Ithe blank 3 of Fig. 2, which forexample is reduced to inches in thicko ness. In thisinstance I have usedde res A sions about l inch deep, with angles of e, out

90 degrees between 4their" opposite sides.'

The indentations are preferably blunted so 1 es to present no sharpcorners. Thus the bottoms of the valle s or indentations are preferablyabout o an inch wide, the tops of,l the! projections being about thesame In thenext pass the metal is fed between j", .the middle and, up errolls of the' three-A f ,hi h mill and may e reduced to about 1i -inies'thickness as lshown et 4 in Fig. 3.

`In this vpass the depressions in 'the fupper face are nearly removedwhile depressions 5 corresponding to those of the vupper ,face erefoi-ined vin ,the lower foce,`

Inthe third pass of Fig.4,tbe metal piece 5 maybe reduced to 11' inchesin thickness,

. the indentations formed in` the' second pass on the lower vfece bein'removed or Vsubstantially lremoved, whl e indentationjs rmaller'thanthose first formed are made in .the u per fece.l In this case thedepressions llve'hout i inch dee ,and the angle between 5 th positssides o the'depressions is about 'i 30 egress, the corners bein bluntedas be- 4 f In the next or fourt pass through this second three-highmhh-the metal piece 6. i shown'in Fig. 5, maybereduced to the form 40oili ,.6, the upper depressions ofthe third ing' removed while A'responding de.

pressions ereformed in-` th ower face. In" the fth pass 'of Fi{tliemetalpiece- -in'eybe .reduced to o an 'inchthick, and

; frolnnthis point the skel muy be rolled in fthe ordinary manner witplain faced rolls.

The blank is rolled as o.'A le blank tllr'uhoutthe. .rolling 10 i 011ses dis :wished what@ V*known as pack Y' indicated ty thlfenisrgeashowing `me Figz'' the lprojet'ztons 9 on' 'the roll- 10 ore f shape,opggr'ovidedfwithsmclined rnd-"sides 11. l hess inclined f ubstanpmlleliac'es of the proections bring upon thernet in thedirecmdieaitedthe l'arrows in. Fig.' 8. u the work fdcned on the tony o.l n'jetrable amount, 'makin the' iihiyfoi'ln ndjdnse. Theorieninponentey of' the forces actupon` f [tel canht between the'projections, "und-'th metsl squeezed into the s ece betweenthem"usv the'full draft ofrt e rolls v615 is brought tobear. Thfesewedge-shape pro`jections of af subtantial depth comperedto the thickness of the blank,are importentin obtenin my imprdwed result.' I, referebly `indent t erolles deeglfas possi le within certain practic limi Their depth will ofcourse' be limited by structurel considerations' es tac-weakness of theroll.` and also by abilit to remove't e marks by smooth `rolls in tieafter-treat nt.V

The treatment to which the metal blank is subjected modifies the outeror surface portion, so that when 'the original blank is of soft or openstructure, if the edgewf the furnished late be etched, it will show a.well define and substantiel outer loyer or layers a of denser and moreresistant substance than the inner or 'body portion b. This I illustratein Fig. 7;.

In rolling -plates for skelp, the indent` ing motion must be stop ed atsuch a. thick ness, lthhtv the plete wil have an even or Vchmercifilly`finished surface. My plates, Wever, muy 4he made ,slightly rougher "Inthe ordinary rolled lates.

The breakin up of e surface or' surfaces by we ging en then smoothingghanges the structure' of the outer ortion of the metal and improves it.Ins abs or plates of ordinary thickness, I ma use indentations on4 bothsides,,ea,ehir`i exitation V92s being' approximatel -eig'hth or morey ofthickness of the b ank, so' that .the com. bined depths of.theinldentetions on 'both sides are practically 25`pe`rcent. or more ofthe thickness ofthe blank. n

t. hendvantages 'of `m invention ap reciated by those ski 'ed intliejert. Not 'on' y d o the plates or' articles betterjresistcorrosion, but their outer portionfis lso' made-of hi her quality forAlneny other 10E purposes. t -the same time 'the cost of rollmv isincreasedvery-little, iffnny, since no ed itionel passes are ordinarilyrequired, and the only added' cost is that of sha the roll or 4rollehevingthe surface w i formsthe indentetidns. l

The invention is applicable-'toen rolled steel articles.V It nmybeepplied-'i reils, shapes, plates, carnwhe'els, -ba'rs "or 'roll.products ofnll kinds-which are either-Y rolled in to finished lproducts or *are efteiwerd i F worked up into 4rli's.hed prbdcte. The.treated pcu'tionlnntgy4 e :used 'on' one orlinre fsurfeces of 'thearticle, and menyj changes may b e made in the Vformancl arrangement: 'Vof .the a paratus -`and method, without 61 parting romniy invention. L Iif,

"1. `e new erticleoemnnufactutef Y body of' motely having` en' exteriorskin coin Aposed of perticlesconipr*inthe-2pm .7

wrought metal article having a body portion of ordinary wroughtcharacterand Having an outer shell portion integral there- ."th the shelllportion having a portion of of/123 antially uniform density and homoitythan the body portion and of the same chemical constituents and insubstam gnfeity, of substantial depth, of a greater' tinlly the some`proportions as the body portion. 10 In testimony whereof, I havehereunto set N.M. GmFFIN, H. M. CORWIIN.

